Hi, I hope this is in the right place, I'm new here but I'm in a bit of a panic because I depend on my Macbook for work and I need help figuring out why it's doing this. Any help or suggestions would be greatly appreciated!! I have a MacBook Air, purchased in June of 2013, running OSX 10.9.4. It's a 1.3 GHz model with Intel Core i5 and 4 GB, 1600 MHz DDR3 memory. This morning I woke up and it was shut down. As soon as I started it up, the fan began to run, much louder than normal. It was immediately after start-up, and I've replicated that condition, so it doesn't seem to be related to over-heating. I saw that a rogue process might be responsible in forum posts, so I checked Activity Monitor. Right now the only application open is Chrome. It's not showing any process using more than Chrome at around 12%, but the "system" is shown as using around 75% of my CPU. I tried rebooting in safe mode, and with no programs open in safe mode "system" is using 60% CPU. I couldn't afford the extended warranty, so I'm several months out of warranty and can't really afford to pay for repairs. Any suggestions would be appreciated.